To cite package ‘gamm4’ in publications use:

Wood S, Scheipl F, Schneuwly A (2026). gamm4: Generalized Additive Mixed Models using 'mgcv' and 'lme4'. R package version 0.3-0, https://CRAN.R-project.org/package=gamm4.

Corresponding BibTeX entry:

  @Manual{,
    title = {gamm4: Generalized Additive Mixed Models using 'mgcv' and
      'lme4'},
    author = {Simon Wood and Fabian Scheipl and Arno Schneuwly},
    year = {2026},
    note = {R package version 0.3-0},
    url = {https://CRAN.R-project.org/package=gamm4},
  }